While creating Purchase Requisition MRP item message should appear

Dear All

We have a requirement wherein, at the time of PR creation and release, if the item (material code) is MRP related then sytem should give a message that item is belong to MRP item list. Hence at the time of creation of PR system should compare the entered material code with the MRP item list and a warning message should appear accordingly.

Kindly suggest the way forward.

Thanks in advance.